UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported) May 23, 2000 ------------ SONUS PHARMACEUTICALS, INC. (Exact name of Registrant as specified in its charter) Delaware 0-26866 95-4343413 - -------------------------------------------------------------------------------- (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No) 22026 20th Avenue S.E., Bothell, Washington 98021 ------------------------------------------------- (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code (425) 487-9500 -------------- Not Applicable -------------- (Former name or former address, if changed since last report) Page 1 of 6 Exhibit Index on Page 4 ITEMS 1 THROUGH 4, 6, 8 AND 9 ARE NOT APPLICABLE. ITEM 5. OTHER EVENTS Reference is made to the press release issued to the public by the registrant on May 23, 2000, the text of which is attached hereto as Exhibit 99.1, for a description of the events reported pursuant to this Form 8-K. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS (a) Financial Statements Not Applicable (b) Pro Forma Financial Information Not Applicable (c) Exhibits
EXHIBIT NO. DESCRIPTION ----------- ----------- 99.1 Press Release dated May 23, 2000.
2 SIGNATURE In accordance with the requirements of the Securities Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SONUS PHARMACEUTICALS, INC. Date: May 25, 2000 By: /s/ Richard J. Klein ----------------------------- Richard J. Klein Vice President, Finance and Assistant Secretary 3 EXHIBIT INDEX EXHIBIT NO. DESCRIPTION - ----------- ----------- 99.1 Press Release dated May 23, 2000. 4